package com.example.demo.img_ACII;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

/**
 * @author denis.huang
 * @since 2017/8/10
 */
public class AsciiPic {
  /**
   * @param imgPath 图片路径
   * @param outPath 输出路径
   * @param acc 精度，最小1
   */
  public static void createAsciiPic(String imgPath, String outPath, int acc) {
    String base = "#@&$%87Oo!;^~.";// 字符串由复杂到简单
    try {
      FileWriter fw = new FileWriter(outPath);
      BufferedImage image = ImageIO.read(new File(imgPath));
      for (int y = 0; y < image.getHeight(); y += 3*acc) {
        for (int x = 0; x < image.getWidth(); x += acc) {
          int pixel = image.getRGB(x, y);
          int r = (pixel & 0xff0000) >> 16;
          int g = (pixel & 0xff00) >> 8;
          int b = pixel & 0xff;
          float gray = 0.299f * r + 0.578f * g + 0.114f * b;
          int index = Math.round(gray * (base.length() + 1) / 255);
          fw.write(index >= base.length() ? " " : String.valueOf(base.charAt(index)));
        }
        fw.write("\r\n");
      }
      fw.close();
    } catch (final IOException e) {
      e.printStackTrace();
    }
  }

  public static void main(final String[] args) {
    AsciiPic.createAsciiPic("D:\\timg.jpg", "D:\\timg.txt", 5);
  }
}